1243321349 has 2 divisors, whose sum is σ = 1243321350. Its totient is φ = 1243321348.

The previous prime is 1243321301. The next prime is 1243321363. The reversal of 1243321349 is 9431233421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1084384900 + 158936449 = 32930^2 + 12607^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243321349 - 2¹⁶ = 1243255813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243324349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621660674 + 621660675.

It is an arithmetic number, because the mean of its divisors is an integer number (621660675).

Almost surely, 2^1243321349 is an apocalyptic number.

It is an amenable number.

1243321349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243321349 is an equidigital number, since it uses as much as digits as its factorization.

1243321349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 1243321349 is about 35260.7621727041. The cubic root of 1243321349 is about 1075.2954223946.

The spelling of 1243321349 in words is "one billion, two hundred forty-three million, three hundred twenty-one thousand, three hundred forty-nine".